1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    *
5    *
6    *
7    * The contents of this file are subject to the terms of the Liferay Enterprise
8    * Subscription License ("License"). You may not use this file except in
9    * compliance with the License. You can obtain a copy of the License by
10   * contacting Liferay, Inc. See the License for the specific language governing
11   * permissions and limitations under the License, including but not limited to
12   * distribution rights of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.portal.kernel.servlet;
24  
25  import com.liferay.portal.kernel.util.StringPool;
26  
27  import java.io.IOException;
28  
29  import java.util.HashMap;
30  import java.util.Map;
31  
32  import javax.servlet.ServletException;
33  import javax.servlet.http.HttpServlet;
34  import javax.servlet.http.HttpServletRequest;
35  import javax.servlet.http.HttpServletResponse;
36  
37  /**
38   * <a href="PortalDelegatorServlet.java.html"><b><i>View Source</i></b></a>
39   *
40   * <p>
41   * See http://support.liferay.com/browse/LEP-2297.
42   * </p>
43   *
44   * @author Olaf Fricke
45   * @author Brian Wing Shun Chan
46   */
47  public class PortalDelegatorServlet extends HttpServlet {
48  
49      public static void addDelegate(String subContext, HttpServlet delegate) {
50          if (subContext == null) {
51              throw new IllegalArgumentException();
52          }
53  
54          if (delegate == null) {
55              throw new IllegalArgumentException();
56          }
57  
58          _delegates.put(subContext, delegate);
59      }
60  
61      public static void removeDelegate(String subContext) {
62          if (subContext == null) {
63              throw new IllegalArgumentException();
64          }
65  
66          _delegates.remove(subContext);
67      }
68  
69      public void service(
70              HttpServletRequest request, HttpServletResponse response)
71          throws IOException, ServletException {
72  
73          String uri = request.getPathInfo();
74  
75          if ((uri == null) || (uri.length() == 0)) {
76              throw new ServletException("Path information is not specified");
77          }
78  
79          String[] paths = uri.split(StringPool.SLASH);
80  
81          if (paths.length < 2) {
82              throw new ServletException("Path " + uri + " is invalid");
83          }
84  
85          HttpServlet delegate = _delegates.get(paths[1]);
86  
87          if (delegate == null) {
88              throw new ServletException(
89                  "No servlet registred for context " + paths[1]);
90          }
91  
92          Thread currentThread = Thread.currentThread();
93  
94          ClassLoader contextClassLoader = currentThread.getContextClassLoader();
95  
96          try {
97              ClassLoader delegateClassLoader =
98                  delegate.getClass().getClassLoader();
99  
100             currentThread.setContextClassLoader(delegateClassLoader);
101 
102             delegate.service(request, response);
103         }
104         finally {
105             currentThread.setContextClassLoader(contextClassLoader);
106         }
107     }
108 
109     private static Map<String, HttpServlet> _delegates =
110         new HashMap<String, HttpServlet>();
111 
112 }